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參數資料
| 型號： | TPS40077PWPR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, HTSSOP-16 |
| 文件頁數： | 26/43頁 |
| 文件大小： | 847K |
| 代理商： | TPS40077PWPR |
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f Frequency kHz
20
10
0
10
20
30
40
Gain
dB
G029
0.1
1
10
1k
100
High-Frequency Gain
fZ1
fZ2
fP1
fP2
VOUT + VREF
R
Z1 ) RSET
R
SET
(50)
GAIN + RPZ2
R
Z1 ) RP1
R
Z1
R
P1
(51)
f
P1 +
1
2p
R
P1
C
PZ1
(52)
f
P2 +
C
P2 ) CZ2
2p
R
PZ2
C
P2
C
Z2
[
1
2p
R
PZ2
C
P2
(53)
f
Z1 +
1
2p
R
Z1
C
PZ1
(54)
f
Z2 +
1
2p
R
PZ2 ) RP1
C
Z2
[
1
2p
R
PZ2
C
Z2
(55)
SLUS714D – JANUARY 2007 – REVISED APRIL 2009 ..................................................................................................................................................... www.ti.com
Figure 33. Type-III Compensation Typical Bode Plot
The high-frequency gain and the break (pole and zero) frequencies are calculated using the following equations.
Looking at the PWM and LC bode plot, there are a few things which must be done to achieve stability.
1. Place two zeros close to the double pole, e.g., fZ1 = fZ2 = 4.3 kHz
2. Place both poles well above the crossover frequency. The crossover frequency was selected as one sixth the
switching frequency, fco1 = 50 kHz, fP1 = 66 kHz
3. Place the second pole at three times fco1. This ensures that the overall system gain falls off quickly to give
good gain margin, fp2 = 150 kHz
4. The high-frequency gain should be sufficient to ensure 0 dB at the required crossover frequency, GAIN = –1
× gain of PWM and LC at the crossover frequency, GAIN = 16.9 dB
Using these values and Equation 50 through Equation 55, the Rs and Cs around the compensation network can
be calculated.
1. Set RZ1 = 51 k
32
Copyright 2007–2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS40077
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